Function validateAttachmentFileType

apps/sim/lib/uploads/utils/validation.ts:238–251

(fileName: string)

 * reasonably attach to a chat message. Rejects executables and unknown types.
 */
export function validateAttachmentFileType(fileName: string): FileValidationError | null {
  const raw = extractExtension(fileName)
  const extension = isAlphanumericExtension(raw) ? raw : ''

  if (!SUPPORTED_ATTACHMENT_EXTENSIONS.includes(extension)) {
    return {
      code: 'UNSUPPORTED_FILE_TYPE',
      message: `Unsupported file type${extension ? `: ${extension}` : ` for "${fileName}"`}. Supported types include documents, code, images, audio, and video.`,
      supportedTypes: [...SUPPORTED_ATTACHMENT_EXTENSIONS],
    }
  }

  return null
}

/**
 * Validate if a file type is supported for document processing